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Model 37 UltraStable
Medical Instrumentation
PC Board Mountable Pressure Sensor 0-100 mV Output Differential Pressure Wide Temperature Range
Calibration Process Control Factory Automation Air Flow Management Leak Detection
DESCRIPTION
The Model 37 is a high performance, temperature compensated, piezoresistive silicon pressure sensor packaged in a differential TO-8 configuration. It provides excellent performance and long-term stability. Differential pressure ranges from 0-15 PSI to 0-250 PSI are available. Integral temperature compensation is provided over a range of -20C to +85C using laser-trimmed resistors. An additional laser-trimmed resistor is included to normalize pressure sensitivity variations by programming the gain of an external differential amplifier. This provides sensitivity interchangeability of 1%. Please refer to the low pressure section for information on products with operating pressures less than 0-2 PSI. For an uncompensated sensor (Model 35) please contact the factory for
FEATURES
TO-8 Package -20C to +85C Compensated Temperature Range 0.1% Non-linearity 0.5% Temperature Performance 1.0% Interchangeable Span (provided by gain set resistor) Solid State Reliability Low Power
additional information.
DIMENSIONS
STANDARD RANGES
Range 0 to 15 0 to 30 0 to 50 0 to 100 0 to 250 psid

1-42
TO-8 - Wide Temperature Range
PC Board Mountable Pressure Sensor PERFORMANCE SPECIFICATIONS
Supply Current: 1.5mA Ambient Temperature: 25C (Unless otherwise specified)
PARAMETERS Full Scale Output Span, (without gain set resistor) Zero Pressure Output Pressure Non-linearity Pressure Hysteresis Input Resistance Temperature Error - Span Temperature Error - Zero Temperature Coefficient - Resistance Thermal Hysteresis - Zero Short Term Stability of Offset Short Term Stability of Span Long Term Stability of Offset Long Term Stability of span Supply Current Response Time (10% to 90%) Output Noise Output Load Resistance Insulation Resistance (50 VDC) Pressure Overload Operating Temperature Storage Temperature Media Weight -40C to +125C -50C to +150C 5 50 3X 0.5 2500 0.05 0.01 3500 0.3 0.1 0.145 0.05 0.05 0.05 0.1 0.1 1.5 1.0 1.0 2.0 MIN 75 TYP 100 MAX 150 2 0.1 0.1 4500 0.5 0.5
Model 37 UltraStable
UNITS mV mV % Span % Span
NOTES 1 3 2
% Span % Span %/C % Span % Span % Span % Span % Span mA msec V p-p M M Rated 3, 4 3, 4 4 4 11 11 12 12 5 6 7 8 13 9, 14
Non-corrosive Gases Compatible with Wetted Materials 3 Grams
10
Notes 1. Output span of unamplified sensor. 2. Best Fit Straight Line. 3. For Model 37, compensation resistors are an integral part of the sensor package; no additional external resistors are required. Pins 11 and 12 must be kept open. Model 37 is interchangeable only when used with a gain stage as shown in the Gain Set Circuit. 4. Temperature range: -20C to +85C in reference to 25C. 5. Guarantees input/output ratiometricity. 6. For a zero-to-full scale pressure step change. 7. 10 Hz to 1 kHz.
8. 9. 10. 11. 12. 13. 14.
Prevents increase of TC-Span due to output loading. For top side application, 3X or 500 psi maximum, whichever is less. 20 psi for 2 psi and 5 psi versions. Wetted materials are glass, ceramic, silicon, RTV, nickel, gold, and aluminum. Normalized offset bridge voltage: 7 days. 1 year. Between case and sensing element. For backside application, 3X not to exceed 100 psi on all ranges.
CONNECTIONS
APPLICATION SCHEMATIC
ORDERING INFORMATION
June 2001
TO-8 - Wide Temperature Range
LEADER Electronic Co., Ltd - 116, Jianghuali, Jianghua Road, Jiangmen City, GD, PRC Tel: + 86 750 3101711, 3379183 Fax: + 86 750 3388669 Website: www.leadersensors.com - e-mail: leader@leadersensors.com

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